559 lines
21 KiB
Python
Executable File
559 lines
21 KiB
Python
Executable File
#!/usr/bin/python -uO
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# Copyright (c) 2010 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import cPickle as pickle
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from errno import EEXIST
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from gzip import GzipFile
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from os import mkdir
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from os.path import basename, dirname, exists, join as pathjoin
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from sys import argv, exit
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from time import time
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from swift.common.ring import RingBuilder
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MAJOR_VERSION = 1
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MINOR_VERSION = 1
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EXIT_RING_CHANGED = 0
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EXIT_RING_UNCHANGED = 1
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EXIT_ERROR = 2
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def search_devs(builder, search_value):
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# d<device_id>z<zone>-<ip>:<port>/<device_name>_<meta>
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orig_search_value = search_value
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match = []
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if search_value.startswith('d'):
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i = 1
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while i < len(search_value) and search_value[i].isdigit():
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i += 1
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match.append(('id', int(search_value[1:i])))
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search_value = search_value[i:]
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if search_value.startswith('z'):
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i = 1
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while i < len(search_value) and search_value[i].isdigit():
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i += 1
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match.append(('zone', int(search_value[1:i])))
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search_value = search_value[i:]
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if search_value.startswith('-'):
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search_value = search_value[1:]
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if len(search_value) and search_value[0].isdigit():
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i = 1
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while i < len(search_value) and search_value[i] in '0123456789.':
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i += 1
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match.append(('ip', search_value[:i]))
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search_value = search_value[i:]
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if search_value.startswith(':'):
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i = 1
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while i < len(search_value) and search_value[i].isdigit():
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i += 1
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match.append(('port', int(search_value[1:i])))
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search_value = search_value[i:]
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if search_value.startswith('/'):
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i = 1
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while i < len(search_value) and search_value[i] != '_':
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i += 1
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match.append(('device', search_value[1:i]))
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search_value = search_value[i:]
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if search_value.startswith('_'):
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match.append(('meta', search_value[1:]))
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search_value = ''
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if search_value:
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raise ValueError('Invalid <search-value>: %s' % repr(orig_search_value))
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devs = []
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for dev in builder.devs:
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if not dev:
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continue
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matched = True
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for key, value in match:
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if key == 'meta':
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if value not in dev.get(key):
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matched = False
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elif dev.get(key) != value:
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matched = False
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if matched:
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devs.append(dev)
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return devs
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SEARCH_VALUE_HELP = '''
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The <search-value> can be of the form:
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d<device_id>z<zone>-<ip>:<port>/<device_name>_<meta>
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Any part is optional, but you must include at least one part.
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Examples:
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d74 Matches the device id 74
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z1 Matches devices in zone 1
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z1-1.2.3.4 Matches devices in zone 1 with the ip 1.2.3.4
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1.2.3.4 Matches devices in any zone with the ip 1.2.3.4
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z1:5678 Matches devices in zone 1 using port 5678
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:5678 Matches devices that use port 5678
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/sdb1 Matches devices with the device name sdb1
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_shiny Matches devices with shiny in the meta data
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_"snet: 5.6.7.8" Matches devices with snet: 5.6.7.8 in the meta data
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Most specific example:
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d74z1-1.2.3.4:5678/sdb1_"snet: 5.6.7.8"
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Nerd explanation:
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All items require their single character prefix except the ip, in which
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case the - is optional unless the device id or zone is also included.
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'''.strip()
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CREATE_HELP = '''
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ring_builder <builder_file> create <part_power> <replicas> <min_part_hours>
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Creates <builder_file> with 2^<part_power> partitions and <replicas>.
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<min_part_hours> is number of hours to restrict moving a partition more
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than once.
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'''.strip()
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SEARCH_HELP = '''
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ring_builder <builder_file> search <search-value>
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Shows information about matching devices.
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%(SEARCH_VALUE_HELP)s
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'''.strip() % globals()
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ADD_HELP = '''
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ring_builder <builder_file> add z<zone>-<ip>:<port>/<device_name>_<meta> <wght>
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Adds a device to the ring with the given information. No partitions will be
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assigned to the new device until after running 'rebalance'. This is so you
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can make multiple device changes and rebalance them all just once.
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'''.strip()
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SET_WEIGHT_HELP = '''
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ring_builder <builder_file> set_weight <search-value> <weight>
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Resets the device's weight. No partitions will be reassigned to or from the
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device until after running 'rebalance'. This is so you can make multiple
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device changes and rebalance them all just once.
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%(SEARCH_VALUE_HELP)s
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'''.strip() % globals()
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SET_INFO_HELP = '''
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ring_builder <builder_file> set_info <search-value>
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<ip>:<port>/<device_name>_<meta>
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Resets the device's information. This information isn't used to assign
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partitions, so you can use 'write_ring' afterward to rewrite the current
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ring with the newer device information. Any of the parts are optional
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in the final <ip>:<port>/<device_name>_<meta> parameter; just give what you
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want to change. For instance set_info d74 _"snet: 5.6.7.8" would just
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update the meta data for device id 74.
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%(SEARCH_VALUE_HELP)s
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'''.strip() % globals()
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REMOVE_HELP = '''
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ring_builder <builder_file> remove <search-value>
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Removes the device(s) from the ring. This should normally just be used for
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a device that has failed. For a device you wish to decommission, it's best
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to set its weight to 0, wait for it to drain all its data, then use this
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remove command. This will not take effect until after running 'rebalance'.
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This is so you can make multiple device changes and rebalance them all just
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once.
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%(SEARCH_VALUE_HELP)s
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'''.strip() % globals()
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SET_MIN_PART_HOURS_HELP = '''
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ring_builder <builder_file> set_min_part_hours <hours>
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Changes the <min_part_hours> to the given <hours>. This should be set to
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however long a full replication/update cycle takes. We're working on a way
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to determine this more easily than scanning logs.
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'''.strip()
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if __name__ == '__main__':
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if len(argv) < 2:
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print '''
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ring_builder %(MAJOR_VERSION)s.%(MINOR_VERSION)s
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%(CREATE_HELP)s
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ring_builder <builder_file>
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Shows information about the ring and the devices within.
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%(SEARCH_HELP)s
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%(ADD_HELP)s
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%(SET_WEIGHT_HELP)s
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%(SET_INFO_HELP)s
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%(REMOVE_HELP)s
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ring_builder <builder_file> rebalance
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Attempts to rebalance the ring by reassigning partitions that haven't been
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recently reassigned.
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ring_builder <builder_file> validate
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Just runs the validation routines on the ring.
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ring_builder <builder_file> write_ring
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Just rewrites the distributable ring file. This is done automatically after
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a successful rebalance, so really this is only useful after one or more
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'set_info' calls when no rebalance is needed but you want to send out the
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new device information.
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%(SET_MIN_PART_HOURS_HELP)s
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Quick list: create search add set_weight set_info remove rebalance write_ring
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set_min_part_hours
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Exit codes: 0 = ring changed, 1 = ring did not change, 2 = error
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'''.strip() % globals()
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exit(EXIT_RING_UNCHANGED)
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if exists(argv[1]):
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builder = pickle.load(open(argv[1], 'rb'))
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for dev in builder.devs:
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if dev and 'meta' not in dev:
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dev['meta'] = ''
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elif len(argv) < 3 or argv[2] != 'create':
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print 'Ring Builder file does not exist: %s' % argv[1]
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exit(EXIT_ERROR)
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elif argv[2] == 'create':
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if len(argv) < 6:
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print CREATE_HELP
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exit(EXIT_RING_UNCHANGED)
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builder = RingBuilder(int(argv[3]), int(argv[4]), int(argv[5]))
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backup_dir = pathjoin(dirname(argv[1]), 'backups')
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try:
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mkdir(backup_dir)
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except OSError, err:
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if err.errno != EEXIST:
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raise
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pickle.dump(builder, open(pathjoin(backup_dir,
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'%d.' % time() + basename(argv[1])), 'wb'), protocol=2)
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pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
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exit(EXIT_RING_CHANGED)
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backup_dir = pathjoin(dirname(argv[1]), 'backups')
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try:
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mkdir(backup_dir)
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except OSError, err:
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if err.errno != EEXIST:
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raise
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ring_file = argv[1]
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if ring_file.endswith('.builder'):
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ring_file = ring_file[:-len('.builder')]
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ring_file += '.ring.gz'
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if len(argv) == 2:
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print '%s, build version %d' % (argv[1], builder.version)
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zones = 0
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balance = 0
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if builder.devs:
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zones = len(set(d['zone'] for d in builder.devs if d is not None))
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balance = builder.get_balance()
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print '%d partitions, %d replicas, %d zones, %d devices, %.02f ' \
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'balance' % (builder.parts, builder.replicas, zones,
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len([d for d in builder.devs if d]), balance)
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print 'The minimum number of hours before a partition can be ' \
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'reassigned is %s' % builder.min_part_hours
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if builder.devs:
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print 'Devices: id zone ip address port name ' \
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'weight partitions balance meta'
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weighted_parts = builder.parts * builder.replicas / \
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sum(d['weight'] for d in builder.devs if d is not None)
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for dev in builder.devs:
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if dev is None:
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continue
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if not dev['weight']:
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if dev['parts']:
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balance = 999.99
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else:
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balance = 0
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else:
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balance = 100.0 * dev['parts'] / \
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(dev['weight'] * weighted_parts) - 100.0
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print ' %5d %5d %15s %5d %9s %6.02f %10s %7.02f %s' % \
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(dev['id'], dev['zone'], dev['ip'], dev['port'],
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dev['device'], dev['weight'], dev['parts'], balance,
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dev['meta'])
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exit(EXIT_RING_UNCHANGED)
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if argv[2] == 'search':
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if len(argv) < 4:
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print SEARCH_HELP
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exit(EXIT_RING_UNCHANGED)
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devs = search_devs(builder, argv[3])
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if not devs:
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print 'No matching devices found'
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exit(EXIT_ERROR)
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print 'Devices: id zone ip address port name ' \
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'weight partitions balance meta'
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weighted_parts = builder.parts * builder.replicas / \
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sum(d['weight'] for d in builder.devs if d is not None)
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for dev in devs:
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if not dev['weight']:
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if dev['parts']:
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balance = 999.99
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else:
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balance = 0
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else:
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balance = 100.0 * dev['parts'] / \
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(dev['weight'] * weighted_parts) - 100.0
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print ' %5d %5d %15s %5d %9s %6.02f %10s %7.02f %s' % \
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(dev['id'], dev['zone'], dev['ip'], dev['port'],
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dev['device'], dev['weight'], dev['parts'], balance,
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dev['meta'])
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exit(EXIT_RING_UNCHANGED)
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elif argv[2] == 'add':
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# add z<zone>-<ip>:<port>/<device_name>_<meta> <wght>
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if len(argv) < 5:
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print ADD_HELP
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exit(EXIT_RING_UNCHANGED)
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if not argv[3].startswith('z'):
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print 'Invalid add value: %s' % argv[3]
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exit(EXIT_ERROR)
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i = 1
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while i < len(argv[3]) and argv[3][i].isdigit():
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i += 1
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zone = int(argv[3][1:i])
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rest = argv[3][i:]
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if not rest.startswith('-'):
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print 'Invalid add value: %s' % argv[3]
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exit(EXIT_ERROR)
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i = 1
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while i < len(rest) and rest[i] in '0123456789.':
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i += 1
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ip = rest[1:i]
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rest = rest[i:]
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if not rest.startswith(':'):
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print 'Invalid add value: %s' % argv[3]
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exit(EXIT_ERROR)
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i = 1
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while i < len(rest) and rest[i].isdigit():
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i += 1
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port = int(rest[1:i])
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rest = rest[i:]
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if not rest.startswith('/'):
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print 'Invalid add value: %s' % argv[3]
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exit(EXIT_ERROR)
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i = 1
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while i < len(rest) and rest[i] != '_':
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i += 1
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device_name = rest[1:i]
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rest = rest[i:]
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meta = ''
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if rest.startswith('_'):
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meta = rest[1:]
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weight = float(argv[4])
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for dev in builder.devs:
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if dev is None:
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continue
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if dev['ip'] == ip and dev['port'] == port and \
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dev['device'] == device_name:
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print 'Device %d already uses %s:%d/%s.' % \
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(dev['id'], dev['ip'], dev['port'], dev['device'])
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exit(EXIT_ERROR)
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next_dev_id = 0
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if builder.devs:
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next_dev_id = max(d['id'] for d in builder.devs if d) + 1
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builder.add_dev({'id': next_dev_id, 'zone': zone, 'ip': ip,
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'port': port, 'device': device_name, 'weight': weight,
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'meta': meta})
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print 'Device z%s-%s:%s/%s_"%s" with %s weight got id %s' % \
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(zone, ip, port, device_name, meta, weight, next_dev_id)
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pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
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exit(EXIT_RING_UNCHANGED)
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elif argv[2] == 'set_weight':
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if len(argv) != 5:
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print SET_WEIGHT_HELP
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exit(EXIT_RING_UNCHANGED)
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devs = search_devs(builder, argv[3])
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weight = float(argv[4])
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if not devs:
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print 'No matching devices found'
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exit(EXIT_ERROR)
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if len(devs) > 1:
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print 'Matched more than one device:'
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for dev in devs:
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print ' d%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_' \
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'"%(meta)s"' % dev
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if raw_input('Are you sure you want to update the weight for '
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'these %s devices? (y/N) ' % len(devs)) != 'y':
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print 'Aborting device modifications'
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exit(EXIT_ERROR)
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for dev in devs:
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builder.set_dev_weight(dev['id'], weight)
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print 'd%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_"%(meta)s" ' \
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'weight set to %(weight)s' % dev
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pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
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exit(EXIT_RING_UNCHANGED)
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elif argv[2] == 'set_info':
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if len(argv) != 5:
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print SET_INFO_HELP
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exit(EXIT_RING_UNCHANGED)
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devs = search_devs(builder, argv[3])
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change_value = argv[4]
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change = []
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if len(change_value) and change_value[0].isdigit():
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i = 1
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while i < len(change_value) and change_value[i] in '0123456789.':
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i += 1
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change.append(('ip', change_value[:i]))
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change_value = change_value[i:]
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if change_value.startswith(':'):
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i = 1
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while i < len(change_value) and change_value[i].isdigit():
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i += 1
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change.append(('port', int(change_value[1:i])))
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change_value = change_value[i:]
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if change_value.startswith('/'):
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i = 1
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while i < len(change_value) and change_value[i] != '_':
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i += 1
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change.append(('device', change_value[1:i]))
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change_value = change_value[i:]
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if change_value.startswith('_'):
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change.append(('meta', change_value[1:]))
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change_value = ''
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if change_value or not change:
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raise ValueError('Invalid set info change value: %s' %
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repr(argv[4]))
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if not devs:
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print 'No matching devices found'
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exit(EXIT_ERROR)
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if len(devs) > 1:
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print 'Matched more than one device:'
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for dev in devs:
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print ' d%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_' \
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'"%(meta)s"' % dev
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if raw_input('Are you sure you want to update the info for '
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'these %s devices? (y/N) ' % len(devs)) != 'y':
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print 'Aborting device modifications'
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exit(EXIT_ERROR)
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for dev in devs:
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orig_dev_string = \
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'd%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_"%(meta)s"' % dev
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test_dev = dict(dev)
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for key, value in change:
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test_dev[key] = value
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for check_dev in builder.devs:
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if not check_dev or check_dev['id'] == test_dev['id']:
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continue
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if check_dev['ip'] == test_dev['ip'] and \
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check_dev['port'] == test_dev['port'] and \
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check_dev['device'] == test_dev['device']:
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print 'Device %d already uses %s:%d/%s.' % \
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(check_dev['id'], check_dev['ip'], check_dev['port'],
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check_dev['device'])
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exit(EXIT_ERROR)
|
|
for key, value in change:
|
|
dev[key] = value
|
|
new_dev_string = \
|
|
'd%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_"%(meta)s"' % dev
|
|
print 'Device %s is now %s' % (orig_dev_string, new_dev_string)
|
|
pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
|
|
exit(EXIT_RING_UNCHANGED)
|
|
|
|
elif argv[2] == 'remove':
|
|
if len(argv) < 4:
|
|
print REMOVE_HELP
|
|
exit(EXIT_RING_UNCHANGED)
|
|
devs = search_devs(builder, argv[3])
|
|
if not devs:
|
|
print 'No matching devices found'
|
|
exit(EXIT_ERROR)
|
|
if len(devs) > 1:
|
|
print 'Matched more than one device:'
|
|
for dev in devs:
|
|
print ' d%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_' \
|
|
'"%(meta)s"' % dev
|
|
if raw_input('Are you sure you want to remove these %s devices? '
|
|
'(y/N) ' % len(devs)) != 'y':
|
|
print 'Aborting device removals'
|
|
exit(EXIT_ERROR)
|
|
for dev in devs:
|
|
builder.remove_dev(dev['id'])
|
|
print 'd%(id)sz%(zone)s-%(ip)s:%(port)s/%(device)s_"%(meta)s" ' \
|
|
'marked for removal and will be removed next rebalance.' % dev
|
|
pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
|
|
exit(EXIT_RING_UNCHANGED)
|
|
|
|
elif argv[2] == 'rebalance':
|
|
devs_changed = builder.devs_changed
|
|
last_balance = builder.get_balance()
|
|
parts, balance = builder.rebalance()
|
|
if not parts:
|
|
print 'No partitions could be reassigned.'
|
|
print 'Either none need to be or none can be due to ' \
|
|
'min_part_hours [%s].' % builder.min_part_hours
|
|
exit(EXIT_RING_UNCHANGED)
|
|
if not devs_changed and abs(last_balance - balance) < 1:
|
|
print 'Cowardly refusing to save rebalance as it did not change ' \
|
|
'at least 1%.'
|
|
exit(EXIT_RING_UNCHANGED)
|
|
builder.validate()
|
|
print 'Reassigned %d (%.02f%%) partitions. Balance is now %.02f.' % \
|
|
(parts, 100.0 * parts / builder.parts, balance)
|
|
if balance > 5:
|
|
print '-' * 79
|
|
print 'NOTE: Balance of %.02f indicates you should push this ' % \
|
|
balance
|
|
print ' ring, wait at least %d hours, and rebalance/repush.' \
|
|
% builder.min_part_hours
|
|
print '-' * 79
|
|
ts = time()
|
|
pickle.dump(builder.get_ring(),
|
|
GzipFile(pathjoin(backup_dir, '%d.' % ts +
|
|
basename(ring_file)), 'wb'), protocol=2)
|
|
pickle.dump(builder, open(pathjoin(backup_dir,
|
|
'%d.' % ts + basename(argv[1])), 'wb'), protocol=2)
|
|
pickle.dump(builder.get_ring(), GzipFile(ring_file, 'wb'), protocol=2)
|
|
pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
|
|
exit(EXIT_RING_CHANGED)
|
|
|
|
elif argv[2] == 'validate':
|
|
builder.validate()
|
|
exit(EXIT_RING_UNCHANGED)
|
|
|
|
elif argv[2] == 'write_ring':
|
|
pickle.dump(builder.get_ring(),
|
|
GzipFile(pathjoin(backup_dir, '%d.' % time() +
|
|
basename(ring_file)), 'wb'), protocol=2)
|
|
pickle.dump(builder.get_ring(), GzipFile(ring_file, 'wb'), protocol=2)
|
|
exit(EXIT_RING_CHANGED)
|
|
|
|
elif argv[2] == 'pretend_min_part_hours_passed':
|
|
builder.pretend_min_part_hours_passed()
|
|
pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
|
|
exit(EXIT_RING_UNCHANGED)
|
|
|
|
elif argv[2] == 'set_min_part_hours':
|
|
if len(argv) < 4:
|
|
print SET_MIN_PART_HOURS_HELP
|
|
exit(EXIT_RING_UNCHANGED)
|
|
builder.change_min_part_hours(int(argv[3]))
|
|
print 'The minimum number of hours before a partition can be ' \
|
|
'reassigned is now set to %s' % argv[3]
|
|
pickle.dump(builder, open(argv[1], 'wb'), protocol=2)
|
|
exit(EXIT_RING_UNCHANGED)
|
|
|
|
print 'Unknown command: %s' % argv[2]
|
|
exit(EXIT_ERROR)
|